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Dissection of the Polar and Non‐Polar Contributions to Aromatic Stacking Interactions in Solution

Published version
Peer-reviewed

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Authors

Piękoś, Justyna A 
Hunter, Christopher A  ORCID logo  https://orcid.org/0000-0002-5182-1859

Abstract

jats:titleAbstract</jats:title>jats:pAromatic stacking interactions have been a matter of study and debate due to their crucial role in chemical and biological systems. The strong dependence on orientation and solvent together with the relatively small interaction energies have made evaluation and rationalization a challenge for experimental and theoretical chemists. We have used a supramolecular cage formed by two tris(pyridylmethyl)amines units to build chemical Double Mutant Cycles (DMC) for the experimental measurement of the free energies of π‐stacking interactions. Extrapolating the substituent effects to remove the contribution due to electrostatic interactions reveals that there is a substantial contribution to the measured stacking interaction energies which is due to non‐polar interactions (−3 to −6 kJ moljats:sup−1</jats:sup>). The perfectly flat nature of the surface of an aromatic ring gives π‐stacking an inherent advantage over non‐polar interactions with alkyl groups and accounts for the wide‐spread prevalence of stacking interactions in Nature.</jats:p>

Description

Keywords

34 Chemical Sciences, 3407 Theoretical and Computational Chemistry

Journal Title

Angewandte Chemie

Conference Name

Journal ISSN

0044-8249
1521-3757

Volume Title

Publisher

Wiley
Sponsorship
Università degli Studi di Padova (P-DiSC#10BIRD2020-UNIPD)